Pump doesn't prime completely

Hayward SP3400VSP pump. Kid shut off the inlet to the pump and it over heated some, not sure how bad. Pump runs but basket doesnt fill/prime completely. I replaced the impeller and diffuser with no change. The ring with the diffuser was not in the pump when I took it apart, if I install the diffuser ring it does not move water at all. I've tried the sealant on all the seals and have the same results.